1. The thief ..................have escaped through this well-locked window.
- (a) must
- (b) mustn't
- (c) can't
- (d) should

2. Samy .................at work this morning. I didn't see him.
- (a) can't have
- (b) can't be
- (c) must have
- (d) must be

3. She ................. Her car keys are still here.
- (a) may have
- (b) shouldn't have
- (c) must have
- (d) can't have

4. It .................very windy during the night. There are leaves all over the ground.
- (a) must be
- (b) must have
- (c) can't have been
- (d) can't be

5. There is water all over the floor. Someone .................to turn off the shower.
- (a) must forget
- (b) must have
- (c) can't have
- (d) can have

6. They left two hours ago, so they .................arrived by now. It is not far.
- (a) must
- (b) must have
- (c) can't have
- (d) have

7. He .................me early this morning.
- (a) can have
- (b) might have
- (c) mustn't have
- (d) might rung

8. Let's try to find them. They .................gone very far.
- (a) must
- (b) mustn't have
- (c) can't have
- (d) could have

9. Maha will wait for her husband. She has forgotten her keys. She .................have brought them.
- (a) must
- (b) may
- (c) might
- (d) should

10. When he got married, he .................to Cairo.
- (a) moved
- (b) used to move
- (c) use to move
- (d) is used to

11. He used to be thin, but now he .................
- (a) isn't
- (b) doesn't
- (c) wasn't
- (d) didn't

12. He no longer smokes as he .................
- (a) would do
- (b) used to do
- (c) is used to doing
- (d) never used to

13. Petrol and oil .................as much as they are today.
- (a) isn't used
- (b) hasn't been
- (c) wasn't used
- (d) won't be used

14. Hatim .................newspapers; he likes to get the latest news online instead.
- (a) never read
- (b) used to read
- (c) is used to
- (d) isn't used to

15. He left his glasses at school yesterday. I'm hoping someone ..................
- (a) must have
- (b) might have
- (c) can't have
- (d) can have

16. I have seen her car outside. She ..................
- (a) can't arrive
- (b) can't have
- (c) might arrive
- (d) must have

17. She .................caught her bus because she would have been here by now.
- (a) can't have
- (b) might have
- (c) could have
- (d) must have

The thief can't have escaped through this well-locked window. This sentence suggests it's impossible for the escape since the window was well-locked.
Samy can't have been at work this morning. I didn't see him. This suggests the impossibility that Samy was at work because he wasn't seen.
She can't have. Her car keys are still here. The presence of her car keys indicates she could not have left.
It must have been very windy during the night. There are leaves all over the ground. This infers the logical conclusion that the wind caused this.
There is water all over the floor. Someone must have forgotten to turn off the shower. This is the logical explanation for the water being there.
They left two hours ago, so they must have arrived by now. It is not far. Given the distance and time, it is logical to assume arrival.
He might have rung me early this morning. This suggests it is possible he called.
Let's try to find them. They can't have gone very far. This indicates it's unlikely they traveled a long distance.
Maha will wait for her husband. She has forgotten her keys. She should have brought them. This implies it was necessary for her to bring the keys.
When he got married, he moved to Cairo. This indicates a past action that was completed upon marriage.
He used to be thin, but now he isn't. This shows a change in condition over time.
He no longer smokes as he used to do. This indicates smoking was a past habit.
Petrol and oil wasn't used as much as they are today. This suggests a comparison between past and present usage.
Hatim isn't used to newspapers; he likes to get the latest news online instead. This suggests that reading newspapers isn't his habit.
He left his glasses at school yesterday. I'm hoping someone might have found them. This indicates a possibility they were found.
I have seen her car outside. She must have arrived. This indicates a logical conclusion based on the presence of her car.
She can't have caught her bus because she would have been here by now. This indicates she probably missed the bus.